Tubular cutter-lathe



(No Model.) 2 Sheets-Sheet 1.

v W. H. LENHART. TUBULAR CUTTER LATHE.

Patented Jan. 4, 1887.

N. PETERS Pmwullw ra bar. Washin ton. D. C.

(No Model.) 5 2 Sheets-Sheet 2.

' W. H; LENHART.

TUBULAR CUTTER LATHE;

No. 355,540. Patented Jan. 4. 1887.

f UN TED STATES {PATENT OFFICE.

WILLIAM H. LENHARror DEFIANCE, OHIO.

TU BULAR CUTT'ER-LATH E.

.EPECIFICATION forming part of Letters Patent No. 355,540, dated January 4, 1887,

Application filed April 9, 1886. Serial No. 198,215. (No model.) 7

To aZZ whom it 12mg concern.-

Be it known that 1, WILLIAM H. LENHART, of Defiance, in the county of Defianceand State of Ohio, have invented new. and useful Improvementsin Lathes; and I do hereby do clare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to a new and useful improvement in a lathe of the kind commonly known asa handle-turning lathe;" and the invention consists in the improved construction and arrangement of the parts, as herein after described and claimed.

In the drawings which accompany this specification, Figure 1 is a vertical longitudinal sec tion of my improved lathe. Fig. 2 is a plan thereof. end of the machine. Fig, 4 is a detached face View of the cutter-head, showing the arrangement of the sliding knives. I

A A are a number of sticks to be turned.

They are placed vertically upon each other within a well formedby a suitable frame or rack secured on top of the bed of the lathe in line with the feed-rolls O,which latter are constructed and arranged as usual.

B is a feed-chain passing around sprocketwheels B, and having lugs K, all so arranged that the latter in traveling with the chain carry the lowest stick which rests upon the chain to the feed-rolls, which take hold of it and feed it through the cutter-head.

D is a tubular shaft journaled in suitable bearings, a, and provided upon its ends with the heads P R.

S is a drive-pulley secured upon the tubular shaft, and suitable power is applied to this pulley to revolve it at a high rate of speed when set in motion.

I is a feed-shaft carrying the pulley I, to whichthepowerisapplied. Itisprovidedwith suitable intermediate gearing to communicate the proper motion to the feed-chain, to the live feed-rolls, and to the pattern-wheel F, as shown.

The head 1? has adj ustably secured to it the radial knives E, which operate upon the square stick while the latter is'pushed through the cutter-head by the chain-feed, thereby round-' ing it off straight.

Fig. 3 is an end elevation of the rear The head R is provided with radial recesses or slots 1), preferably of dovetail shape, in which are guided the radially-movable knife- .holders G, having the radial knives E adj ustably secured to them. The outer ends of the knife-holders G, which are formed on an incline, c, are held in contact by means of suit able springs, d, with the inclined guide-flange 6, carried by aslidinghub, f. Thesliding hub f has a loose collar, to which the forked ends of the lever H are pivotally secured. The lever H is fulcrumed at h, and its free end is provided with a tracer-point, M,whichis kept in contact with the pattern-wheel F, all so arranged that the face of the latter, by its contactwith the tracer, governs the position of the knife-holders, drawing them in and out as desired, to have the knives E shape the stick previously roughed out by the knives E. The face of the pattern-wheel F is preferably of the same length with the stick, so as to have them both travel at a like rate of speed.

In the ends of the tubular. shaft D are removably secured the collars L, which are of suitable bore to guide the stick through the cutter-head, and for different-sized work suitable collars are inserted in lieu-thereof.

The centrifugal force acquired by the radially-sliding knives tends to draw the tracerpoint of the lever H out of contact with the pattern-wheel, and has to be counteracted by a sufficiently-strong spring, H, the tension of which will overcome said action and keep the tracer point in contact with the face of thepattern-wheel; but as it is impossible in this man ner to closely counterbalance the centrifugal force which is always varying with the speed, Ipreferably use the construction shown in Fig. 4, in which G are radially-sliding blocks in the head B, one for each knife-holder, and both the knife-holders and sliding blocks have rackteeth,which mesh into a pinion, T, secured betern-wheel, and with any degree of speed. A

spring, H, of relatively small tension only, is

required to overcome the friction of the parts. For ordinary and heavy work a little roller,

M, journaled in the end of the tracing-lever H, is preferably employed instead of the tracing-point M. r g

It will be seen that my lathe feeds and turns the sticks perfectly automatic. The chain-feed counterbalancing of the centrifugal force of the sliding knives in the manner described is a very valuable improvement, as it entirely eliminates the troublesome influence of this factor.

What I claim as my invention is 1. The combination,with thetube D and the heads P R at opposite ends of said tube and carrying fixed and radially-movable knives E E, respectively, of the changeable collarsL L in said tube, at opposite ends thereof, substantially as and for the purpose specified. I

2. The combination, with the tube D, provided with heads P R at opposite ends, the collars Lin said tube,at opposite ends thereof,

and the driving-pulley S,between said heads,of the knives E, secured to the head P, the head B being provided with radial recesses b, the radially-movable knife-holders G, working in said recesses, and-the radial knives adjustably secured to said knife-holders, substantially as and for'the purpose specified.

3. In a lathe of the kind described, a cutter'head consisting of the tubular shaft D, heads 1? Eat opposite ends of said tube, fixed knives E on the head P, radially-movable knives E on the head R, changeable collars L in said tube, and drive-pulleys S, all arranged to operate substantially as described.

4. In a lathe of the kind described, the combination,with the head R, of the radially-movable knife-holders G thereon, and having in clines c, the sliding hub f, carrying inclined flange e, embracing said inclines c, the loose collar 9, embracing said hub, the tracing-lever H, connected with said collar, and the revolving pattern-wheel F, all arranged to operate substantially as described.

5. In a lathe of the kind described, the combination,with the head R, of the radially-sliding knife holders and the radially sliding blocks G, working. in guidesin said head, and a rack and-pinion engagement between each pair thereof, substantially as described.

WILLIAM H. LENHAR'P.

Witnesses: Y

W. G. JARVIS, LYON M. ROBERTS. 

